Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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Switch: KLFLOR54DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
541-273 A Klamath Falls OR 9638 QWEST CORPORATION 670      
541-850 A Klamath Falls OR 9638 QWEST CORPORATION 670      
541-851 A Klamath Falls OR 9638 QWEST CORPORATION 670      
541-880 A Klamath Falls OR 9638 QWEST CORPORATION 670      
541-882 A Klamath Falls OR 9638 QWEST CORPORATION 670      
541-883 A Klamath Falls OR 9638 QWEST CORPORATION 670      
541-884 A Klamath Falls OR 9638 QWEST CORPORATION 670      
541-885 A Klamath Falls OR 9638 QWEST CORPORATION 670      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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